Application-specific regulator powers 5V system rails

Alpha and Omega Semiconductor Limited has released a new family of application-specific EZBuck regulators. The highly integrated AOZ2295QI-05 has the most compact footprint in the industry to support 5V rails in desktop and laptop computing systems.

High-performance personal computing systems, supporting add-on features, and more USB type-C ports, improve the 5V output current to more than 10A. In such feature-rich personal computing systems, typical power implementations need a controller with external discrete power FETs or two low-current converters to attain the high current needed of the 5V rail. This increases component count and a larger PCB area, increasing system cost. In contrast, the company’s highly integrated solution includes all the power silicon in a single, thermally enhanced QFN 4mm x 4mm package for 12A, supplying a compact solution size with industrial-leading efficiency and thermal performance.

The converter includes features particularly designed to satisfy key requirements of the 5V rail. The device is designed with a TON extension mode so the converter can still output stable 5V while the battery cell voltage drops to 5.5V.

In many practical design and application environments, there is also a high possibility of having audible noise when system 5V goes to a light load with less than 20kHz switching frequency. AOS’ proprietary Constant On-Time architecture supplies an ultrasonic mode to guarantee operating frequency working above 30kHz to prevent audible noise in the full application range.

The new device also features a high level of integration and protection features of the EZBuck product family, featuring a PGOOD output, an integrated bootstrap diode, and an integrated soft start. Protection features include cycle-by-cycle current limit, SCP, OVP, and Thermal shutdown.

“The load current capability of the AOZ2295QI-05 offers designers an easy-to-use solution to support high power 5V system in a compact size. In today’s ever-shrinking desktop motherboard or laptop form factors, PCB real estate is at a premium. Utilising AOS’ EZBuck regulator technology enables AOS to ease the job of the system designer,” said Wayne Lee, Power IC Marketing at AOS.